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Tailpiece Union 417-4060 - Bubbles Supply

Tailpiece Union 417-4060

Part #: 417-4060

$4.51
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1-year warrantySame-day ship before 3pm CTPerfect Fit Guarantee30-day returns

About this union/fitting

The Waterway Tailpiece Union 417-4060 is a critical plumbing connection component designed for spa and hot tub circulation systems. This OEM replacement part features 1-1/2" male buttress thread (MBT) to 1-1/2" male pipe thread (MPT) connections, providing a secure transition between different pipe threading standards in your spa's plumbing network.

Built to Waterway's exacting standards, this tailpiece union ensures reliable, leak-free connections in high-pressure spa environments. At Bubbles Supply, we guarantee an exact fit for your system and offer same-day shipping on all orders, backed by our comprehensive 1-year warranty. This genuine Waterway component delivers the quality and durability your spa deserves, maintaining optimal water flow and system integrity. Always verify thread specifications and existing plumbing connections before installation to ensure proper fitment with your spa's circulation system.

Exact part number

417-4060

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Also known as / Replaces

This part replaces or is interchangeable with:

  • Buttress Thread Union Body
  • MBT to MPT Adapter
  • Tailpiece
  • Union Tailpiece

Looking for an older part number? Check our supersession lookup tool

Technical specifications

Union size
1-1/2 inch

Plumbing notes

  • Union size: 1-1/2 inch

Need help measuring? Email hello@bubblessupply.com with a photo of your existing plumbing.

Common symptoms this part fixes

If your spa is showing any of these signs, this part is likely your fix:

  • Leaking at pump or equipment union connection
  • Stripped or cross-threaded union tailpiece
  • Cracked tailpiece from freeze damage or overtightening
  • Water weeping around the MBT-to-MPT transition
  • Unable to achieve a seal at the plumbing junction

Not sure if this is your problem? Try our diagnostic centre or .

Before you buy — quick checklist

  • Confirm your existing tailpiece uses 1-1/2" male buttress thread (MBT) on one end and 1-1/2" male pipe thread (MPT) on the other
  • Inspect the mating union nut and O-ring — if the nut or O-ring is also damaged, order those separately
  • Verify the plumbing configuration — buttress thread is not interchangeable with standard NPT, so misidentifying thread type is the most common fitment error
  • Check whether the tailpiece is bonded into a fitting or threaded — bonded tailpieces require cutting and re-gluing, not just unthreading
  • Measure pipe diameter on both sides of the existing tailpiece before ordering

Reading the checklist now prevents 90% of returns. Worth the 60 seconds.

Install difficulty: Medium — Some experience neededTypically 30-60 minutes

Warranty

1 year manufacturer warranty against defects

Covers manufacturing defects. Does not cover improper installation, normal wear, or accidental damage.

Warranty claims: warranty@bubblessupply.com

Perfect Fit Guarantee

Ordered with our help and the part doesn't fit? Contact us before installation. We'll resolve it with an exchange, replacement recommendation, or return approval.

Learn about our Perfect Fit Guarantee →

Shipping

We ship across the US and Canada. US orders ship from our US warehouse to US customers; Canadian orders ship from our Canadian warehouse to Canadian customers — no cross-border shipping, no surprise duties. In-stock orders placed before 3pm CT ship same day. Standard shipping $9.95 flat rate. Free shipping on orders over $200. Express options available at checkout.

Returns

30-day hassle-free returns on unused parts in original packaging. Contact us before returning to receive your RMA number.

Frequently asked questions

Check the Compatibility section above to confirm fitment for your spa brand and model. If your model is not listed, use our fitment selector at /pages/find-my-part or ask our parts AI for a personalized recommendation.

In-stock orders placed before 3pm CT ship the same day. You will receive tracking information by email as soon as your order ships.

We accept returns within 30 days of delivery for unused items in original packaging. Email returns@bubblessupply.com with your order number to start a return. Installed electrical parts cannot be returned for safety reasons.

Yes, all new parts come with a 1-year warranty against manufacturing defects. Warranty does not cover damage from improper installation or normal wear and tear.

Customer reviews

AI Fitment Assistant

Tell us your spa model and we will confirm this part fits before you buy.

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